지르코니아 복합 세라믹스의 비커스 경도에 대한 와이블 확률 해석

Abstract

The Vickers hardness test is a common method used to characterize the hardness of ceramic materials. However, the hardness is not a deterministic value, it is a random variable. The second chapter is to investigate the statistical properties of bending strength and a set of Vickers hardness values in single ZrO2 and composite ZrO2/SiC with SiC additive. In this work, the characteristic value and variation are compared with the results based on Weibull statistical analysis. The probability distributions of the bending strength and Vickers hardness were well followed Weibull distribution. The scale parameter and shape parameter are evaluated in as-received ZrO2 and ZrO2/SiC composite ceramics, and their heat treated ceramics. The third chapter is to investigate the statistical properties of the bending strength and Vickers hardness in ZrO2 monolithic and ZrO2/SiC composites depending on the amount of TiO2 additives. The bending strength and Vickers hardness were found to agree well with the Weibull probability distribution. We evaluate the scale parameter and shape parameter in as-received ZrO2 and ZrO2/SiC/TiO2 ceramics, as well as their heat treated ceramics. We also evaluate the parameters in accordance with the increase in the indentation load. The fourth chapter is to investigate the statistical properties of Vickers hardness in ZrO2 composites according to ball size of shot peening. Vickers hardness were good found to follow a Weibull probability distribution. The scale parameter and shape parameter were evaluated in ZrO2 composites, and their heat treated ceramics. It was also evaluated in accordance with size of the indentation load and the shot ball.